PRETENDED NEW METAL; 1PA|,LADIUM. 



From thefe experiments, we may form the following tatle, 

 ihewing the difference between the true and the calculated 

 mean of fpecific gravity in the alloys of palladium. 



89 



' Comparifon of 

 the fpecific 

 gravities of thefd 

 alloys with the 

 computed denfi* 

 ties. 



I expofed ten grains of palladium to the adion of potafli, in Palladium fufed 

 fufion during half an hour. The fubftance loft its brilHancy, ^iigh^°^'JJ ^j*. 

 and diminilhed two grains and a half in weight; thefe were liancy. 

 found in the potafh. 



The adlion of ibda upon palladium, does not appear to be With foda. 

 quite fo violent. 



Ammonia, allowed to remain for fome days upon palladium. Ammonia in the 

 acquires a flight bluifn tinge, and holds a fmall portion of ^e"minerox?da" 

 oxide of palladium in folution. In all thefe cafes, the adiontion, and takes 

 of the alkali is promoted by the contadl of the atmofpheric air, "P <'^'<ic. 

 the oxigen of which combines the metal, in favour of the 

 affinity the oxide of palladium poflelfes towards the alkali. 



Some of the pieces of palladium weremoreeafily n<5led upon 

 by the acids than others; and, in general, thofe of the greateft 

 fpecific gravity were the leaft affedted. Upon the whole, how- 

 ever, the following ftatement may be taken as the average of 

 the habitudes of palladium with the acid folvents, 



* In the fpecific gravities of the difFerent metals, I have followeil 

 the table given in our bell elementary work. Dr. Thonipfon's Syftem 

 pf ChemiHry, 



Sulphuric 



